Initial download is extremely slow and times out in IDLE

[Pikamander2]

When run in IDLE for the first time (at least on Windows), the tool floods the IDLE shell with thousands of download progress messages and gradually grind to a halt until it reaches several bytes per second and eventually fails.

It works flawlessly in cmd/terminal, but it would be nice if it worked correctly in IDLE as well. I realize that IDLE has a lot of issues and may or may not be worth fully supporting, but currently there's not even any indication to the user about what the problem is.

[Pikamander2]

Possibly related: https://stackoverflow.com/questions/21198857/python-multiprocessing-example-not-working/

[jxmorris12]

Thanks for letting me know. I think this is the related issue: https://stackoverflow.com/questions/35895864/what-is-the-difference-between-cmd-and-idle-when-using-tqdm/35900117#35900117

[jxmorris12]

But that's just about the progress bar. The command shouldn't fail. @Pikamander2 can you post the error message if there is one?

[Pikamander2]

@jxmorris12 - Just tested it on a different setup (Windows 7 + IDLE 3.8.9 whereas last time I used Windows 10 + IDLE 3.9.0) and the exact same thing happened. The download rate starts out at a reasonable value but then rapidly deteriorates down to a few KB/s and eventually just a few bytes per second. After about 10-20 minutes, it finally fails with a zipfile.BadZipFile error:

Unzipping C:\Users\MyUser\AppData\Local\Temp\tmpl84l608i.zip to C:\Users\MyUser\.cache\language_tool_python.
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    tool = language_tool_python.LanguageTool('en-US')
  File "C:\Program Files\Python38\lib\site-packages\language_tool_python\server.py", line 62, in __init__
    self._start_server_on_free_port()
  File "C:\Program Files\Python38\lib\site-packages\language_tool_python\server.py", line 238, in _start_server_on_free_port
    self._start_local_server()
  File "C:\Program Files\Python38\lib\site-packages\language_tool_python\server.py", line 248, in _start_local_server
    download_lt()
  File "C:\Program Files\Python38\lib\site-packages\language_tool_python\download_lt.py", line 154, in download_lt
    download_zip(language_tool_download_url, download_folder)
  File "C:\Program Files\Python38\lib\site-packages\language_tool_python\download_lt.py", line 129, in download_zip
    unzip_file(downloaded_file, directory)
  File "C:\Program Files\Python38\lib\site-packages\language_tool_python\download_lt.py", line 117, in unzip_file
    with zipfile.ZipFile(temp_file.name, 'r') as zip_ref:
  File "C:\Program Files\Python38\lib\zipfile.py", line 1269, in __init__
    self._RealGetContents()
  File "C:\Program Files\Python38\lib\zipfile.py", line 1336, in _RealGetContents
    raise BadZipFile("File is not a zip file")
zipfile.BadZipFile: File is not a zip file

Screenshots of the gradually slowing download rate and messy output: https://imgur.com/a/e5uK0YQ

Here's the code I used:

Command line:
pip install language-tool-python

IDLE:
import language_tool_python
tool = language_tool_python.LanguageTool('en-US')

The issue should be reproducible on any Windows + IDLE setup in which the LanguageTool files have not yet been downloaded.